Clock



FIG. 1 is a front perspective view of a first embodiment of our new design for a clock;

FIG. 2 is a rear perspective view of our new design for a clock;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is left side elevation view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a front elevation view thereof, shown in an environment of use;

FIG. 10 is a front perspective view of a second embodiment of our new design for a clock;

FIG. 11 is a rear perspective view thereof;

FIG. 12 is a front elevation view thereof;

FIG. 13 is a rear elevation view thereof;

FIG. 14 is a right side elevation view thereof;

FIG. 15 is a left side elevation view thereof;

FIG. 16 is a top plan view thereof;

FIG. 17 is a bottom plan view thereof; and,

FIG. 18 is a front elevation view thereof, shown in an environment of use.

The broken lines in the drawings show portions of the clock that form no part of the claimed design. 

CLAIM The ornamental design for a clock, as shown and described. 